DescriptorRenderer: shouldn't render private modifier by default

#KT-31587 Fixed

idea/testData/multiModuleQuickFix/createActual/sealed/header/header.kt

@@ -1,6 +1,6 @@
 // "Create actual class for module testModule_JS (JS)" "true"
 
-expect sealed class <caret>Sealed {
+expect sealed class <caret>Sealed() {
     object Obj : Sealed
 
     class Klass(x: Int) : Sealed

idea/testData/multiModuleQuickFix/createActual/sealed/header/header.kt.after

@@ -1,6 +1,6 @@
 // "Create actual class for module testModule_JS (JS)" "true"
 
-expect sealed class Sealed {
+expect sealed class Sealed() {
     object Obj : Sealed
 
     class Klass(x: Int) : Sealed

idea/testData/multiModuleQuickFix/createActual/sealed/js/Sealed.kt.after

@@ -1,5 +1,5 @@
 // Sealed: to be implemented
-actual sealed class Sealed {
+actual sealed class Sealed actual constructor() {
     actual object Obj : Sealed()
     actual class Klass actual constructor(x: Int) : Sealed()
 

idea/testData/multiModuleQuickFix/createExpect/sealedClass/header/My.kt.after

@@ -1,6 +1,6 @@
 // My: to be implemented
 // DISABLE-ERRORS
-expect sealed class My private constructor(x: Double) {
+expect sealed class My(x: Double) {
     abstract val num: Int
     open fun isGood(): Boolean